The right pulmonary veins carry blood to the

Oxygenated blood to the left atrium of the heart 

Hmm... after some long thinking about this I would have to go with land. After land has been frozen, it thaws (become liquid or soft as a result of warming.) Heat cannot "thaw" because it is apart of air. Water cannot "thaw" because it is already a liquid. Makes sense? I hope this helps! P.S. (A brainliest wouldn't hurt) ;)